JP6498855B1 - Differential gear and differential gear - Google Patents

Differential gear and differential gear Download PDF

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JP6498855B1
JP6498855B1 JP2019007925A JP2019007925A JP6498855B1 JP 6498855 B1 JP6498855 B1 JP 6498855B1 JP 2019007925 A JP2019007925 A JP 2019007925A JP 2019007925 A JP2019007925 A JP 2019007925A JP 6498855 B1 JP6498855 B1 JP 6498855B1
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gear
differential
peripheral surface
recess
annular wall
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JP2020118185A (en
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謙次 深澤
謙次 深澤
加藤　健二
健二 加藤
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Showa Corp
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Showa Corp
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Priority to JP2019007925A priority Critical patent/JP6498855B1/en
Priority to PCT/JP2019/003088 priority patent/WO2020152872A1/en
Priority to CN201980055904.5A priority patent/CN112639334B/en
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Priority to US17/184,552 priority patent/US11391354B2/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H48/00—Differential gearings
    • F16H48/38—Constructional details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/042—Guidance of lubricant
    • F16H57/043—Guidance of lubricant within rotary parts, e.g. axial channels or radial openings in shafts
    • F16H57/0431—Means for guiding lubricant directly onto a tooth surface or to foot areas of a gear, e.g. by holes or grooves in a tooth flank
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H48/00—Differential gearings
    • F16H48/06—Differential gearings with gears having orbital motion
    • F16H48/08—Differential gearings with gears having orbital motion comprising bevel gears
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/042—Guidance of lubricant
    • F16H57/043—Guidance of lubricant within rotary parts, e.g. axial channels or radial openings in shafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/045—Lubricant storage reservoirs, e.g. reservoirs in addition to a gear sump for collecting lubricant in the upper part of a gear case
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/048—Type of gearings to be lubricated, cooled or heated
    • F16H57/0482—Gearings with gears having orbital motion
    • F16H57/0483—Axle or inter-axle differentials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H48/00—Differential gearings
    • F16H48/06—Differential gearings with gears having orbital motion
    • F16H48/08—Differential gearings with gears having orbital motion comprising bevel gears
    • F16H2048/087—Differential gearings with gears having orbital motion comprising bevel gears characterised by the pinion gears, e.g. their type or arrangement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/17—Toothed wheels

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Retarders (AREA)
  • General Details Of Gearings (AREA)

Abstract

【課題】軽量化した差動装置用ギヤ２０及び差動装置１０を提供することを課題とする。【解決手段】本発明は、デフケース１１内に収容された差動装置用ギヤ２０であって、シャフトＬに外嵌される筒状の軸筒部２３と、軸筒部２３の外周面２３ａから突出する環状の環状壁部２４と、環状壁部２４からシャフトＬの軸線方向の一側に突出するギヤ部２５と、環状壁部２４の外周面２４ａから突出する補強リブ２６と、環状壁部２４の内部を肉抜きして成り、シャフトＬの軸線方向の他側に開口する第１凹部３１と、を備えていることを特徴とする。【選択図】図２An object of the present invention is to provide a differential gear 20 and a differential gear 10 that are reduced in weight. The present invention relates to a differential gear gear 20 accommodated in a differential case 11, and includes a cylindrical shaft tube portion 23 fitted on a shaft L and an outer peripheral surface 23a of the shaft tube portion 23. An annular wall portion 24 that protrudes, a gear portion 25 that protrudes from the annular wall portion 24 to one side in the axial direction of the shaft L, a reinforcing rib 26 that protrudes from the outer peripheral surface 24a of the annular wall portion 24, and an annular wall portion It is characterized by comprising a first recess 31 that is formed by hollowing out the interior of 24 and opens to the other side in the axial direction of the shaft L. [Selection] Figure 2

Description

本発明は、差動装置用ギヤ及び差動装置に関する。   The present invention relates to a gear for a differential device and a differential device.

ＦＦベースの四輪駆動車の後部には終減速装置が搭載されており、この終減速装置により推進軸から伝達された駆動力が減速されて左右の後輪に伝達する。また、終減速装置内には、左右の後輪に対して異なる回転速度に振り分けて伝達する差動装置が設けられている。このような差動装置は、下記特許文献に示すように、デフケースと、デフケース内に配置されデフケースの回転軸と直交するピニオンシャフトと、ピニオンシャフトに支持される一対のデフピニオンギヤと、一対のデフピニオンギヤと噛合する一対のサイドギヤとを備えている。   A final reduction gear is mounted on the rear part of the FF-based four-wheel drive vehicle, and the driving force transmitted from the propulsion shaft is reduced by this final reduction gear and transmitted to the left and right rear wheels. In addition, a differential device that distributes and transmits the rotational speeds to the left and right rear wheels is provided in the final reduction gear. As shown in the following patent document, such a differential device includes a differential case, a pinion shaft disposed in the differential case and orthogonal to the rotational axis of the differential case, a pair of differential pinion gears supported by the pinion shaft, and a pair of differential gears. A pair of side gears meshing with the pinion gear is provided.

特開２０１８−１４１５４９号公報JP 2018-141549 A

ここで、上記したデフピニオンギヤとサイドギヤは、高い強度を有し重量化しているため、従来から軽量化が求められている。   Here, since the differential pinion gear and the side gear described above have high strength and are heavy, weight reduction has been conventionally demanded.

本発明は、このような課題を解決するために創作されたものであり、軽量化した差動装置用ギヤ及び差動装置を提供することを目的とする。   The present invention has been created to solve such problems, and an object thereof is to provide a gear for a differential device and a differential device that are reduced in weight.

前記課題を解決するため、本発明に係る差動装置用ギヤは、デフケース内に収容された差動装置用ギヤであって、シャフトに外嵌される筒状の軸筒部と、前記軸筒部の外周面から突出する環状の環状壁部と、前記環状壁部から前記シャフトの軸線方向の一側に突出するギヤ部と、前記環状壁部の外周面から突出する補強リブと、前記環状壁部の内部を肉抜きして成り、前記シャフトの軸線方向の他側に開口する第１凹部と、を備えていることを特徴とする。   In order to solve the above-described problems, a differential gear according to the present invention is a differential gear housed in a differential case, and includes a cylindrical shaft tube portion fitted on a shaft, and the shaft tube. An annular wall portion projecting from the outer peripheral surface of the portion; a gear portion projecting from the annular wall portion to one side in the axial direction of the shaft; a reinforcing rib projecting from the outer peripheral surface of the annular wall portion; It is characterized by comprising a first recess formed by hollowing out the inside of the wall portion and opening to the other side in the axial direction of the shaft.

本発明によれば、差動装置用ギヤが第１凹部により軽量化する。また、補強リブにより強度を確保できる。また、第１凹部に潤滑油が貯留され、摺動部（環状壁部の外周面）並びにギヤ部の噛み合い箇所に継続して潤滑油が供給される。   According to the present invention, the differential gear is lightened by the first recess. Further, the strength can be ensured by the reinforcing rib. Further, the lubricating oil is stored in the first recess, and the lubricating oil is continuously supplied to the sliding portion (the outer peripheral surface of the annular wall portion) and the meshing portion of the gear portion.

第１実施形態における終減速装置の後部を水平方向に切った断面を上方から視た断面図である。It is sectional drawing which looked at the cross section which cut the rear part of the final reduction gear in 1st Embodiment in the horizontal direction from the upper direction. 図１の破線ＩＩで囲まれた範囲を拡大した拡大図である。It is the enlarged view to which the range enclosed with the broken line II of FIG. 1 was expanded. 第１実施形態の左サイドギヤを左方から視た左側面図である。It is the left view which looked at the left side gear of 1st Embodiment from the left. 図３のＩＶ−ＩＶ線の矢視断面図である。FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3. 差動装置内における潤滑油の流路を説明するための概略図である。It is the schematic for demonstrating the flow path of the lubricating oil in a differential device. 第２実施形態における差動装置の一部を拡大した拡大図であり、詳細には、図７のＶＩ−ＶＩ線の矢視断面図である。It is the enlarged view to which a part of differential gear in a 2nd embodiment was expanded, and is an arrow sectional view of the VI-VI line of Drawing 7 in detail. 第２実施形態の左サイドギヤを左方から視た左側面図である。It is the left view which looked at the left side gear of 2nd Embodiment from the left. 第３実施形態における差動装置の一部を拡大した拡大図である。It is the enlarged view to which a part of differential device in 3rd Embodiment was expanded. 第４実施形態における差動装置の一部を拡大した拡大図である。It is the enlarged view to which a part of differential device in 4th Embodiment was expanded.

続いて各実施形態の差動装置を適用した終減速装置について図面を参照しながら説明する。各実施形態で共通する技術的要素には、共通の符号を付するとともに説明を省略する。   Next, a final reduction gear device to which the differential device of each embodiment is applied will be described with reference to the drawings. Technical elements common to the embodiments are denoted by common reference numerals and description thereof is omitted.

（第１実施形態）
終減速装置１は、ＦＦベースの四輪駆動車に搭載され、プロペラシャフトから伝達された動力を減速したうえで左右の後輪に伝達する装置である。
図１に示すように、終減速装置１は、ドライブピニオン２と、リングギヤ３と、差動装置１０と、これらを収容するハウジング４とを備えている。 (First embodiment)
The final reduction gear 1 is a device that is mounted on an FF-based four-wheel drive vehicle and transmits the power transmitted from the propeller shaft to the left and right rear wheels after decelerating the power.
As shown in FIG. 1, the final reduction gear 1 includes a drive pinion 2, a ring gear 3, a differential device 10, and a housing 4 that accommodates these.

ドライブピニオン２は、前後方向に延びる軸線Ｏ１を中心に回転する棒状の部品であり、ドライブピニオン２の後部に円錐台状のピニオンギヤ２ａが形成されている。
リングギヤ３は、左右方向に延びる軸線Ｏ２を中心に回転するリング状の部品である。リングギヤ３は、噛合するピニオンギヤ２ａよりも大径に形成され、ピニオンギヤ２ａから伝達される動力を減速している。リングギヤ３は、差動装置１０の後述するデフケース１１のフランジ１５に対しボルト３ａで締結されている。
ハウジング４内の下部には潤滑油が貯留しており、回転するリングギヤ３がこの潤滑油を掻き上げ、各部品に飛沫した潤滑油が供給される。 The drive pinion 2 is a rod-shaped component that rotates about an axis O <b> 1 extending in the front-rear direction, and a truncated cone-shaped pinion gear 2 a is formed at the rear part of the drive pinion 2.
The ring gear 3 is a ring-shaped component that rotates about an axis O2 extending in the left-right direction. The ring gear 3 has a larger diameter than the meshing pinion gear 2a, and decelerates the power transmitted from the pinion gear 2a. The ring gear 3 is fastened with a bolt 3 a to a flange 15 of a differential case 11 (described later) of the differential device 10.
Lubricating oil is stored in the lower part in the housing 4, and the rotating ring gear 3 scoops up the lubricating oil, and the splashed lubricating oil is supplied to each component.

差動装置１０は、軸線Ｏ２を中心に回転するデフケース１１と、デフケース１１に固定され軸線Ｏ２に直交する方向に延びるピニオンシャフト１２と、ピニオンシャフト１２を中心として回転する一対のデフピニオンギヤ１３、１３と、一対のデフピニオンギヤ１３、１３に噛合する一対のサイドギヤ２０、２０と、各サイドギヤ２０の外周側に配置される一対のワッシャ２７，２７と、を備えている。   The differential 10 includes a differential case 11 that rotates about an axis O2, a pinion shaft 12 that is fixed to the differential case 11 and extends in a direction perpendicular to the axis O2, and a pair of differential pinion gears 13 and 13 that rotate about the pinion shaft 12. And a pair of side gears 20 and 20 meshing with the pair of differential pinion gears 13 and 13, and a pair of washers 27 and 27 disposed on the outer peripheral side of each side gear 20.

デフケース１１は、略球体状を呈するとともに軸線Ｏ２方向に開口するデフケース本体１４と、デフケース本体１４の外周面から突出するフランジ１５と、デフケース本体１４の左端部から突出する円筒状の左ボス部１６と、デフケース本体１４の右端部から突出する円筒状の右ボス部１７と、を備えている。   The differential case 11 is substantially spherical and has a differential case main body 14 that opens in the direction of the axis O2, a flange 15 that protrudes from the outer peripheral surface of the differential case main body 14, and a cylindrical left boss portion 16 that protrudes from the left end of the differential case main body 14. And a cylindrical right boss portion 17 protruding from the right end portion of the differential case main body 14.

デフケース本体１４の内周面１４ａは、ピニオンシャフト１２の中心線Ｏ３と軸線Ｏ２との交点Ｏを中心に略球面状に形成されている。   The inner peripheral surface 14a of the differential case main body 14 is formed in a substantially spherical shape centering on an intersection O between the center line O3 and the axis O2 of the pinion shaft 12.

左ボス部１６は、左テーパーローラーベアリング６を介して、ハウジング４の左壁部に支持されている。左ボス部１６の左開口は、ハウジング４の下部に貯留される潤滑油が流入するための入口となっている。また、左ボス部１６の内周面には、螺旋溝１６ａが形成されており、左ボス部１６内に流入した潤滑油は、螺旋溝１６ａにより案内されてデフケース本体１４内に案内される。   The left boss portion 16 is supported on the left wall portion of the housing 4 via the left tapered roller bearing 6. The left opening of the left boss portion 16 serves as an inlet through which lubricating oil stored in the lower portion of the housing 4 flows. A spiral groove 16 a is formed on the inner peripheral surface of the left boss portion 16, and the lubricating oil that has flowed into the left boss portion 16 is guided into the differential case main body 14 by the spiral groove 16 a.

右ボス部１７は、右テーパーローラーベアリング７を介して、ハウジング４の右壁部に支持されている。
右ボス部１７の右開口は、ハウジング４の下部に貯留される潤滑油が流入するための入口となっている。右ボス部１７の内周面には、螺旋溝１７ａが形成されており、右ボス部１７の内部に流入した潤滑油は、螺旋溝１７ａにより案内されてデフケース本体１４内に案内される。 The right boss portion 17 is supported on the right wall portion of the housing 4 via the right tapered roller bearing 7.
The right opening of the right boss portion 17 serves as an inlet for the lubricating oil stored in the lower portion of the housing 4 to flow in. A spiral groove 17 a is formed on the inner peripheral surface of the right boss portion 17, and the lubricating oil that has flowed into the right boss portion 17 is guided into the differential case main body 14 by the spiral groove 17 a.

なお、ハウジング４の左壁部において、左ボス部１６と対向する部位には、左貫通穴４ａが形成されている。そして、左ドライブシャフト（図１の仮想線Ｌ参照）は、左貫通穴４ａと左ボス部１６内を貫通し、右端部がデフケース本体１４内に配置される。
同様に、ハウジング４の右壁部において、右ボス部１７と対向する部位には、右貫通穴４ｂが形成されている。そして、右ドライブシャフト（図１の仮想線Ｒ参照）は、右貫通穴４ｂと右ボス部１７内を貫通し、左端部がデフケース本体１４内に配置される。 In the left wall portion of the housing 4, a left through hole 4 a is formed at a portion facing the left boss portion 16. The left drive shaft (see the imaginary line L in FIG. 1) passes through the left through hole 4 a and the left boss portion 16, and the right end portion is disposed in the differential case main body 14.
Similarly, a right through hole 4 b is formed in a portion of the right wall portion of the housing 4 that faces the right boss portion 17. The right drive shaft (see the phantom line R in FIG. 1) passes through the right through hole 4 b and the right boss portion 17, and the left end portion is disposed in the differential case main body 14.

一対のサイドギヤ２０，２０は、ピニオンシャフト１２の左側に配置された左サイドギヤ２１と、ピニオンシャフト１２の右側に配置された右サイドギヤ２２と、を備えている。また、左サイドギヤ２１と右サイドギヤ２２は、互いに同一形状に形成されている。以下、左サイドギヤ２１を代表例として説明し、右サイドギヤ２２の説明を省略する。   The pair of side gears 20, 20 includes a left side gear 21 disposed on the left side of the pinion shaft 12 and a right side gear 22 disposed on the right side of the pinion shaft 12. Further, the left side gear 21 and the right side gear 22 are formed in the same shape. Hereinafter, the left side gear 21 will be described as a representative example, and the description of the right side gear 22 will be omitted.

図２に示すように、左サイドギヤ２１は、金型を用いて製造された鍛造品であり、軸線Ｏ２を中心とする円筒状の軸筒部２３と、軸筒部２３の外周面２３ａから突出する環状の環状壁部２４と、デフピニオンギヤ１３と噛合するギヤ部２５と、環状壁部２４の外周面２４ｂから突出する補強リブ２６と、環状壁部２４又はギヤ部２５を肉抜きして成る凹部３０と、を備えている。尚、本発明のサイドギヤ２０は、鍛造品に限定されず、焼結により製造されたものであってもよい。   As shown in FIG. 2, the left side gear 21 is a forged product manufactured using a mold, and protrudes from a cylindrical shaft tube portion 23 centering on the axis O <b> 2 and an outer peripheral surface 23 a of the shaft tube portion 23. The annular annular wall portion 24, the gear portion 25 meshing with the differential pinion gear 13, the reinforcing rib 26 protruding from the outer peripheral surface 24b of the annular wall portion 24, and the annular wall portion 24 or the gear portion 25 are thinned. And a recess 30. In addition, the side gear 20 of this invention is not limited to a forged product, The thing manufactured by sintering may be used.

軸筒部２３内には、左ドライブシャフト（図１の仮想線Ｌ参照）の右端部が挿入されている。また、軸筒部２３の内周面には、左ドライブシャフトのスプライン軸（不図示）とスプライン嵌合するスプライン溝２３ｂが形成され、軸線Ｏ２回りに相対回転しないようになっている。   The right end portion of the left drive shaft (see the imaginary line L in FIG. 1) is inserted into the shaft tube portion 23. Further, a spline groove 23b that is spline-fitted with a spline shaft (not shown) of the left drive shaft is formed on the inner peripheral surface of the shaft cylinder portion 23 so as not to rotate relative to the axis O2.

なお、軸筒部２３の左端部２３ｃと対向する左ボス部１６の右端部には、左ボス部１６の内径よりも拡径した拡径溝１４ｂが形成され、この拡径溝１４ｂ内に軸筒部２３の左端部２３ｃが収容されている。また、軸筒部２３の左端部２３ｃと拡径溝１４ｂは離間しており、隙間Ｓが形成されている。   An enlarged groove 14b having a diameter larger than the inner diameter of the left boss portion 16 is formed at the right end portion of the left boss portion 16 facing the left end portion 23c of the shaft cylinder portion 23, and a shaft is formed in the enlarged diameter groove 14b. The left end portion 23c of the cylindrical portion 23 is accommodated. Further, the left end portion 23c of the shaft tube portion 23 and the enlarged diameter groove 14b are separated from each other, and a gap S is formed.

環状壁部２４は、ギヤ部２５を支持するための部位である。
環状壁部２４の断面形状は、軸筒部２３の外周面２３ａから径方向外側に向うにつれて左側に位置するように傾斜している。このため、環状壁部２４の左側面２４ａと軸筒部２３の外周面２３ａとの間には、断面視で略三角形状の空間（第１凹部３１）が形成されている。なお、第１凹部３１の詳細は後述する。
また、環状壁部２４の外周面２４ｂは、デフケース本体１４の内周面１４ａと対向するとともに円弧状に形成されている。 The annular wall portion 24 is a portion for supporting the gear portion 25.
The cross-sectional shape of the annular wall portion 24 is inclined so as to be positioned on the left side from the outer peripheral surface 23a of the shaft tube portion 23 toward the radially outer side. For this reason, a substantially triangular space (first recess 31) is formed between the left side surface 24 a of the annular wall portion 24 and the outer peripheral surface 23 a of the shaft tube portion 23 in a sectional view. Details of the first recess 31 will be described later.
Further, the outer peripheral surface 24b of the annular wall portion 24 is opposed to the inner peripheral surface 14a of the differential case body 14 and is formed in an arc shape.

図３に示すように、ギヤ部２５は、軸線Ｏ２を中心に周方向に配列された複数の歯２５ａにより構成されている。なお、図３の仮想線Ｍは、歯２５ａの内周部分（環状壁部２４に隠れて視認できない部分）を示している。   As shown in FIG. 3, the gear part 25 is comprised by the some tooth | gear 25a arranged in the circumferential direction centering on the axis line O2. In addition, the imaginary line M of FIG. 3 has shown the inner peripheral part (part hidden and hidden from the annular wall part 24) of the tooth | gear 25a.

図２に示すように、補強リブ２６は、環状壁部２４の外周面２４ｂからデフケース本体１４の内周面１４ａに向って突出する断面略台形状のリブである。また、補強リブ２６は、外周面２４ｂの右端に位置している。
図３に示すように、補強リブ２６は、軸線Ｏ２方向から視ると円形状を呈し、周方向に連続している。 As shown in FIG. 2, the reinforcing rib 26 is a rib having a substantially trapezoidal cross section that protrudes from the outer peripheral surface 24 b of the annular wall portion 24 toward the inner peripheral surface 14 a of the differential case body 14. The reinforcing rib 26 is located at the right end of the outer peripheral surface 24b.
As shown in FIG. 3, the reinforcing rib 26 has a circular shape when viewed from the direction of the axis O2, and is continuous in the circumferential direction.

図２に示すように、ワッシャ２７は、環状壁部２４の外周面２４ｂとデフケース本体１４の内周面１４ａとの間に介在する環状の金属部品である。ワッシャ２７の厚みは、補強リブ２６の突出量よりも大きく、補強リブ２６がデフケース本体１４の内周面１４ａに当接（摺接）しないようになっている。
以上から、終減速装置１に動力が伝達されてデフケース１１が軸線Ｏ２回りに回転する場合、左サイドギヤ２１は、ギヤ部２５が噛合しているデフピニオンギヤ１３から左方へ離間するような荷重を受ける。このため、ワッシャ２７は、環状壁部２４の外周面２４ｂに押圧されてデフケース本体１４の内周面１４ａに押し付けられる。さらに、左サイドギヤ２１がデフケース１１に相対回転する場合、環状壁部２４の外周面２４ｂがワッシャ２７に対し摺動したり、ワッシャ２７がデフケース本体１４の内周面１４ａに対し摺動したりする。言い換えると、外周面２４ｂは、デフケース１１に対して摺動する摺動部を構成している。尚、本実施例ではデフケース本体１４の内周面１４ａと、外周面２４ｂとの間に、ワッシャ２７を設ける構成となっているが、本発明はワッシャ２７を設けない構成としてもよい。 As shown in FIG. 2, the washer 27 is an annular metal part interposed between the outer peripheral surface 24 b of the annular wall portion 24 and the inner peripheral surface 14 a of the differential case body 14. The thickness of the washer 27 is larger than the protruding amount of the reinforcing rib 26 so that the reinforcing rib 26 does not contact (slidably contact) the inner peripheral surface 14a of the differential case body 14.
From the above, when power is transmitted to the final reduction gear 1 and the differential case 11 rotates about the axis O2, the left side gear 21 is loaded with a load that separates leftward from the differential pinion gear 13 with which the gear portion 25 is engaged. receive. For this reason, the washer 27 is pressed against the outer peripheral surface 24 b of the annular wall portion 24 and pressed against the inner peripheral surface 14 a of the differential case main body 14. Further, when the left side gear 21 rotates relative to the differential case 11, the outer peripheral surface 24 b of the annular wall portion 24 slides on the washer 27, or the washer 27 slides on the inner peripheral surface 14 a of the differential case body 14. . In other words, the outer peripheral surface 24 b constitutes a sliding portion that slides with respect to the differential case 11. In this embodiment, the washer 27 is provided between the inner peripheral surface 14a and the outer peripheral surface 24b of the differential case main body 14, but the present invention may be configured without the washer 27.

凹部３０は、環状壁部２４の内部を肉抜きして成る空間であり、左方に開口する第１凹部３１（図２参照）と、第１凹部３１の内面からさらに右方に肉抜きして成る第２凹部３２（図４参照）と、を備えている。   The concave portion 30 is a space formed by hollowing out the inside of the annular wall portion 24, and the first concave portion 31 (see FIG. 2) that opens to the left and the inner surface of the first concave portion 31 are further thinned to the right. And a second recess 32 (see FIG. 4).

図３に示すように、第１凹部３１は、軸線Ｏ２方向を中心に周方向に連続しており、環状を呈している。
図２に示すように、第１凹部３１の断面形状は、前記したように断面視で略三角形状に形成されている。第１凹部３１の外周側を囲む外側周面３１ａは、環状壁部２４の左側面２４ａにより構成され、開口３１ｃ側に向うにつれて径方向外側に位置するように傾斜している。第１凹部３１の内周側を囲む内側周面３１ｂは、軸筒部２３の外周面２３ａにより構成されている。
また、軸筒部２３の外周面２３ａ（第１凹部３１の内側周面３１ｂを含む）は、軸線Ｏ２方向に平坦に形成されている。 As shown in FIG. 3, the 1st recessed part 31 is continuing in the circumferential direction centering on the axis line O2 direction, and is exhibiting the cyclic | annular form.
As shown in FIG. 2, the cross-sectional shape of the 1st recessed part 31 is formed in the substantially triangular shape by the cross sectional view as mentioned above. The outer peripheral surface 31a surrounding the outer peripheral side of the first recess 31 is constituted by the left side surface 24a of the annular wall portion 24, and is inclined so as to be positioned on the radially outer side toward the opening 31c side. An inner peripheral surface 31 b that surrounds the inner peripheral side of the first recess 31 is configured by an outer peripheral surface 23 a of the shaft tube portion 23.
Moreover, the outer peripheral surface 23a (including the inner peripheral surface 31b of the first recess 31) of the shaft tube portion 23 is formed flat in the direction of the axis O2.

図３に示すように、第２凹部３２は、軸線Ｏ２方向から視た場合、ギヤ部２５の各歯２５ａと重なるように形成されている（図３の仮想線Ｍを参照）。
図４に示すように、第２凹部３２は、第１凹部３１の外側周面３１ａ（環状壁部２４の左側面２４ａ）から右方に延びており、歯２５ａの内部を肉抜きして成る空間である。また、第２凹部３２の断面形状は、略三角形状を呈している。 As shown in FIG. 3, the second recess 32 is formed so as to overlap each tooth 25a of the gear portion 25 when viewed from the direction of the axis O2 (see the imaginary line M in FIG. 3).
As shown in FIG. 4, the second recess 32 extends rightward from the outer peripheral surface 31 a of the first recess 31 (the left side 24 a of the annular wall 24), and is formed by hollowing out the inside of the teeth 25 a. It is space. In addition, the cross-sectional shape of the second recess 32 has a substantially triangular shape.

次に潤滑油の流路について図５を参照しながら説明する。
左右輪の差回転により左ボス部１６が軸線Ｏ２回りに回転すると、ハウジング４（図１参照）内から左ボス部１６内に流入した潤滑油は、螺旋溝１６ａにより右側（左サイドギヤ２１側）に案内される（矢印Ａ１参照）。
左ボス部１６の右開口から流出した潤滑油は、軸線Ｏ２の径方向外側に向う遠心力が作用して隙間Ｓ内に入り込み、デフケース本体１４の内周面１４ａに到達する（矢印Ａ２参照）。また、潤滑油には、引き続き遠心力が作用しているため、デフケース本体１４の内周面１４ａに沿って径方向外側に移動する（矢印Ａ３参照）。 Next, the flow path of the lubricating oil will be described with reference to FIG.
When the left boss portion 16 rotates around the axis O2 due to the differential rotation of the left and right wheels, the lubricating oil that has flowed into the left boss portion 16 from the housing 4 (see FIG. 1) is placed on the right side (left side gear 21 side) by the spiral groove 16a. (See arrow A1).
The lubricating oil that has flowed out of the right opening of the left boss portion 16 enters the clearance S by the centrifugal force directed radially outward of the axis O2, and reaches the inner peripheral surface 14a of the differential case body 14 (see arrow A2). . Further, since centrifugal force continues to act on the lubricating oil, it moves radially outward along the inner peripheral surface 14a of the differential case body 14 (see arrow A3).

ここで、デフケース本体１４の内周面１４ａと環状壁部２４の外周面２４ａとの間には、ワッシャ２７及び補強リブ２６が介在し、流路が狭くなっている。よって、補強リブ２６を超えてギヤ部２５及びデフピニオンギヤ１３に供給される潤滑油（矢印Ａ４参照）の量が制限される。
この結果、ワッシャ２７及び補強リブ２６により堰き止められた潤滑油は、デフケース本体１４の内周面１４ａと環状壁部２４の左側面２４ａと軸筒部２３の外周面２３ａとに囲まれる空間に滞り、第１凹部３１内と第２凹部３２内に貯留される。 Here, a washer 27 and a reinforcing rib 26 are interposed between the inner peripheral surface 14a of the differential case main body 14 and the outer peripheral surface 24a of the annular wall portion 24, and the flow path is narrowed. Therefore, the amount of lubricating oil (see arrow A4) supplied to the gear portion 25 and the differential pinion gear 13 beyond the reinforcing rib 26 is limited.
As a result, the lubricating oil blocked by the washer 27 and the reinforcing rib 26 is in a space surrounded by the inner peripheral surface 14a of the differential case main body 14, the left side surface 24a of the annular wall portion 24, and the outer peripheral surface 23a of the shaft tube portion 23. It is stagnated and stored in the first recess 31 and the second recess 32.

以上、第１実施形態によれば、第１凹部３１により環状壁部２４が肉抜きされ、一対のサイドギヤ２０，２０が従来のものよりも軽量化している。一方で、環状壁部２４は、補強リブ２６により強度が向上し、所定強度が確保されている。
また、第１凹部３１には、潤滑油が貯留されている。このため、摺動部（環状壁部２４の外周面２４ｂ）や、サイドギヤ２０のギヤ部２５とデフピニオンギヤ１３との噛み合い箇所に潤滑油を継続して供給することができる。 As mentioned above, according to 1st Embodiment, the annular wall part 24 is thinned by the 1st recessed part 31, and a pair of side gears 20 and 20 are lighter than the conventional one. On the other hand, the strength of the annular wall portion 24 is improved by the reinforcing ribs 26, and a predetermined strength is ensured.
The first recess 31 stores lubricating oil. For this reason, the lubricating oil can be continuously supplied to the sliding portion (the outer peripheral surface 24 b of the annular wall portion 24) or the meshing portion between the gear portion 25 of the side gear 20 and the differential pinion gear 13.

ギヤ部２５の各歯２５ａのそれぞれは、第２凹部３２により肉抜きされて中空になっており、一対のサイドギヤ２０，２０がさらに軽量化している。また、第２凹部３２内に貯留する潤滑油は、各歯２５ａを内部から冷却することができ、冷却性能に優れる。   Each tooth 25a of the gear portion 25 is hollowed out by the second recess 32 to be hollow, and the pair of side gears 20 and 20 are further reduced in weight. Moreover, the lubricating oil stored in the 2nd recessed part 32 can cool each tooth | gear 25a from the inside, and is excellent in cooling performance.

図５に示すように、第１凹部３１の外側周面３１ａ（環状壁部２４の左側面２４ａ）は、第１凹部３１の開口３１ｃ側に近づくにつれて径方向外側に位置するように傾斜している。よって、第１凹部３１内に貯留する潤滑油は、遠心力が作用すると、外側周面３１ａに沿って開口３１ｃ側に移動する（図５の矢印Ｂ参照）。以上から、第１凹部３１内に貯留される潤滑油は、積極的に摺動部（環状壁部２４の外周面２４ｂ）に供給されるようになり、サイドギヤ２０のギヤ部２５とデフピニオンギヤ１３との噛み合い箇所に潤滑油を継続して供給することができる。   As shown in FIG. 5, the outer peripheral surface 31 a of the first recess 31 (the left side surface 24 a of the annular wall portion 24) is inclined so as to be positioned radially outward as it approaches the opening 31 c side of the first recess 31. Yes. Therefore, the lubricating oil stored in the 1st recessed part 31 will move to the opening 31c side along the outer peripheral surface 31a, if a centrifugal force acts (refer arrow B of FIG. 5). From the above, the lubricating oil stored in the first recess 31 is actively supplied to the sliding portion (the outer peripheral surface 24b of the annular wall portion 24), and the gear portion 25 of the side gear 20 and the differential pinion gear 13 are supplied. Lubricating oil can be continuously supplied to the meshing part.

また、軸筒部２３の外周面２３ａは平坦に形成されていることから、潤滑油が外周面２３ａに沿って右方に移動する場合であってもスムーズに移動し（図５の矢印Ｃ参照）、第１凹部３１内に貯留するようになる。   Moreover, since the outer peripheral surface 23a of the shaft cylinder part 23 is formed flat, even if the lubricating oil moves to the right along the outer peripheral surface 23a, it moves smoothly (see arrow C in FIG. 5). ) And the first recess 31 is stored.

また、第１凹部３１及び第２凹部３２は、三角形状を呈していることから、製造時において第１凹部３１及び第２凹部３２を形成する金型を左方に抜き易く、製造が容易となる。   Moreover, since the 1st recessed part 31 and the 2nd recessed part 32 are exhibiting triangular shape, it is easy to extract the metal mold | die which forms the 1st recessed part 31 and the 2nd recessed part 32 at the time of manufacture, and manufacture is easy. Become.

（第２実施形態）
次に第２実施形態の差動装置１１０について説明する。
図６に示すように、差動装置１１０は、デフケース１１と、ピニオンシャフト１２と、一対のデフピニオンギヤ１３（一方のみ図示）と、一対のサイドギヤ１２０（左サイドギヤ１２１のみ図示）と、一対のワッシャ２７（一方のみ図示）と、を備えている。なお、デフケース１１、ピニオンシャフト１２、一対のデフピニオンギヤ１３、１３、並びに一対のワッシャ２７については、第１実施形態で説明したため説明を省略する。 (Second Embodiment)
Next, the differential device 110 of the second embodiment will be described.
As shown in FIG. 6, the differential 110 includes a differential case 11, a pinion shaft 12, a pair of differential pinion gears 13 (only one shown), a pair of side gears 120 (only the left side gear 121 shown), and a pair of washers. 27 (only one is shown). Since the differential case 11, the pinion shaft 12, the pair of differential pinion gears 13 and 13, and the pair of washers 27 have been described in the first embodiment, description thereof will be omitted.

左サイドギヤ１２１は、軸筒部２３と、環状壁部２４と、ギヤ部２５と、補強リブ２６と、凹部３０（第１凹部３１、第２凹部３２）と、環状壁部２４の左側面２４ａから左方に突出する複数のガイドリブ３３と、を備えている。なお、軸筒部２３、環状壁部２４、ギヤ部２５、補強リブ２６、並びに凹部３０（第１凹部３１、第２凹部３２）については第１実施形態で説明したため説明を省略する。   The left side gear 121 includes a shaft cylinder portion 23, an annular wall portion 24, a gear portion 25, a reinforcing rib 26, a concave portion 30 (first concave portion 31 and second concave portion 32), and a left side surface 24 a of the annular wall portion 24. And a plurality of guide ribs 33 projecting leftward. In addition, since the axial cylinder part 23, the annular wall part 24, the gear part 25, the reinforcing rib 26, and the recessed part 30 (the 1st recessed part 31 and the 2nd recessed part 32) were demonstrated in 1st Embodiment, description is abbreviate | omitted.

ガイドリブ３３は、第１凹部３１の開口３１ｃ近傍まで突出している。
図７に示すように、ガイドリブ３３は、軸線Ｏ２方向から視て、第２凹部３２の間に位置し、径方向に延在している。このため、第１凹部３１内の外周側は、複数のガイドリブ３３により周方向に区画されている。 The guide rib 33 protrudes to the vicinity of the opening 31 c of the first recess 31.
As shown in FIG. 7, the guide rib 33 is positioned between the second recesses 32 and extends in the radial direction when viewed from the direction of the axis O2. For this reason, the outer peripheral side in the 1st recessed part 31 is divided by the some guide rib 33 in the circumferential direction.

ガイドリブ３３は、軸線Ｏ２を中心に右回り方向（図７の矢印Ｄ１参照）を向く右側面３３ａと、左回り方向（図７の矢印Ｄ２参照）を向く左側面３３ｂと、を備えている。
右側面３３ａは、軸線Ｏ２から径方向外側に向うにつれて左回り方向に位置するように傾斜している。また、左側面３３ｂは、軸線Ｏ２から径方向外側に向うにつれて右回り方向に位置するように傾斜している。 The guide rib 33 includes a right side surface 33a facing the clockwise direction (see arrow D1 in FIG. 7) and a left side surface 33b facing the counterclockwise direction (see arrow D2 in FIG. 7) about the axis O2.
The right side surface 33a is inclined so as to be positioned in the counterclockwise direction as it goes radially outward from the axis O2. Further, the left side surface 33b is inclined so as to be positioned in the clockwise direction from the axis O2 toward the radially outer side.

以上、第２実施形態によれば、左右輪の差回転によりデフケース１１が軸線Ｏ２回りに回転すると、左サイドギヤ１２１も軸線Ｏ２回りに回転する。
ここで、ガイドリブ３３が右回り方向（図７の矢印Ｄ１参照）に移動すると、ガイドリブ３３間に貯留する潤滑油は、ガイドリブ３３の右側面３３ａにより径方向外側に案内される（図７の矢印Ｅ１参照）。
また、ガイドリブ３３が左回り方向（図７の矢印Ｄ２参照）に移動すると、ガイドリブ３３間に貯留する潤滑油は、ガイドリブ３３の左側面３３ｂにより径方向外側に案内される（図７の矢印Ｅ２参照）。
以上から、左右輪の差回転が生じている場合において、摺動部（環状壁部２４の外周面２４ｂ）に向って潤滑油が流れるようになり、サイドギヤ２０のギヤ部２５とデフピニオンギヤ１３との噛み合い箇所に潤滑油が継続して供給される。 As described above, according to the second embodiment, when the differential case 11 rotates about the axis O2 due to the differential rotation of the left and right wheels, the left side gear 121 also rotates about the axis O2.
Here, when the guide rib 33 moves in the clockwise direction (see arrow D1 in FIG. 7), the lubricating oil stored between the guide ribs 33 is guided radially outward by the right side surface 33a of the guide rib 33 (arrow in FIG. 7). E1).
When the guide rib 33 moves in the counterclockwise direction (see arrow D2 in FIG. 7), the lubricating oil stored between the guide ribs 33 is guided radially outward by the left side surface 33b of the guide rib 33 (arrow E2 in FIG. 7). reference).
From the above, when differential rotation of the left and right wheels occurs, the lubricating oil flows toward the sliding portion (the outer peripheral surface 24b of the annular wall portion 24), and the gear portion 25 of the side gear 20 and the differential pinion gear 13 The lubricating oil is continuously supplied to the meshing portion.

（第３実施形態）
次に第３実施形態の差動装置２１０について説明する。
図８に示すように、差動装置２１０は、デフケース１１と、ピニオンシャフト１２と、一対のデフピニオンギヤ１３（一方のみ図示）と、一対のサイドギヤ２２０（左サイドギヤ２２１のみ図示）と、一対のワッシャ２７（一方のみ図示）を備えている。なお、デフケース１１、ピニオンシャフト１２、一対のデフピニオンギヤ１３、１３、並びに一対のワッシャ２７については、第１実施形態で説明したため説明を省略する。 (Third embodiment)
Next, the differential gear 210 of 3rd Embodiment is demonstrated.
As shown in FIG. 8, the differential device 210 includes a differential case 11, a pinion shaft 12, a pair of differential pinion gears 13 (only one shown), a pair of side gears 220 (only the left side gear 221 shown), and a pair of washers. 27 (only one is shown). Since the differential case 11, the pinion shaft 12, the pair of differential pinion gears 13 and 13, and the pair of washers 27 have been described in the first embodiment, description thereof will be omitted.

左サイドギヤ２２１は、軸筒部２２３と、環状壁部２４と、ギヤ部２５と、補強リブ２６と、第１凹部２３１（凹部２３０）と、を備えている。なお、環状壁部２４、ギヤ部２５、並びに補強リブ２６については第１実施形態で説明したため説明を省略する。   The left side gear 221 includes a shaft tube portion 223, an annular wall portion 24, a gear portion 25, a reinforcing rib 26, and a first recess 231 (a recess 230). Since the annular wall portion 24, the gear portion 25, and the reinforcing rib 26 have been described in the first embodiment, description thereof will be omitted.

軸筒部２２３の外周面２２３ａのうち第１凹部２３１の内周側を囲む部分（内側周面２３１ｂ）は、右方に向うにつれて径方向外側に位置し傾斜している。このため、第１凹部２３１の断面形状は、略正三角形状となっている。
以上、第３実施形態によれば、隙間Ｓを通過した潤滑油に作用する遠心力が弱く、潤滑油が軸筒部２２３の外周面２２３ａに沿って右方に移動しても、内側周面２３１ｂにより径方向外側に案内される（図８の矢印Ｆ参照）。よって、摺動部（環状壁部２４の外周面２４ｂ）に向って潤滑油が流れ易くなり、サイドギヤ２０のギヤ部２５とデフピニオンギヤ１３との噛み合い箇所に潤滑油が継続して供給される A portion (inner peripheral surface 231b) surrounding the inner peripheral side of the first recess 231 in the outer peripheral surface 223a of the shaft tube portion 223 is positioned and inclined radially outward as it goes rightward. For this reason, the cross-sectional shape of the 1st recessed part 231 is a substantially equilateral triangle shape.
As described above, according to the third embodiment, the centrifugal force acting on the lubricating oil that has passed through the gap S is weak, and even if the lubricating oil moves to the right along the outer peripheral surface 223a of the shaft tube portion 223, the inner peripheral surface. It is guided radially outward by 231b (see arrow F in FIG. 8). Therefore, the lubricating oil can easily flow toward the sliding portion (the outer peripheral surface 24b of the annular wall portion 24), and the lubricating oil is continuously supplied to the meshing portion between the gear portion 25 of the side gear 20 and the differential pinion gear 13.

（第４実施形態）
次に第４実施形態の差動装置３１０について説明する。
図９に示すように、差動装置３１０は、デフケース１１と、ピニオンシャフト１２と、一対のデフピニオンギヤ３１３（一方のみ図示）と、一対のサイドギヤ２０，２０と、一対のワッシャ２７，２７と、を備えている。なお、デフケース１１、ピニオンシャフト１２、一対のサイドギヤ２０、並びに一対のワッシャ２７については、第１実施形態で説明したため説明を省略する。 (Fourth embodiment)
Next, the differential gear 310 of 4th Embodiment is demonstrated.
As shown in FIG. 9, the differential 310 includes a differential case 11, a pinion shaft 12, a pair of differential pinion gears 313 (only one shown), a pair of side gears 20, 20, a pair of washers 27, 27, It has. Since the differential case 11, the pinion shaft 12, the pair of side gears 20, and the pair of washers 27 have been described in the first embodiment, the description thereof will be omitted.

デフピニオンギヤ３１３は、軸線Ｏ３を中心とする円筒状の軸筒部３２３と、軸筒部３２３の外周面３２３ａから突出する環状の環状壁部３２４と、サイドギヤ２０と噛合するギヤ部３２５と、環状壁部３２４の外周面３２４ｂから突出する補強リブ３２６と、環状壁部３２４又はギヤ部３２５を肉抜きして成る凹部３３０と、を備えている。   The differential pinion gear 313 includes a cylindrical shaft tube portion 323 centering on the axis O3, an annular wall portion 324 protruding from the outer peripheral surface 323a of the shaft tube portion 323, a gear portion 325 meshing with the side gear 20, and an annular shape The reinforcing rib 326 protrudes from the outer peripheral surface 324b of the wall portion 324, and the concave portion 330 formed by removing the annular wall portion 324 or the gear portion 325.

軸筒部３２４の外周面３２４ａとデフケース本体１４の内周面１４ａとの間には、摺接部材であるワッシャ３２７が介在している。
よって、サイドギヤ２０がデフケース１１に相対回転する場合、環状壁部３２４の外周面３２４ｂがワッシャ３２７に対し摺動したり、ワッシャ３２７がデフケース本体１４の内周面１４ａに対し摺動したりする。 A washer 327, which is a sliding contact member, is interposed between the outer peripheral surface 324 a of the shaft tube portion 324 and the inner peripheral surface 14 a of the differential case body 14.
Therefore, when the side gear 20 rotates relative to the differential case 11, the outer peripheral surface 324 b of the annular wall portion 324 slides with respect to the washer 327, or the washer 327 slides with respect to the inner peripheral surface 14 a of the differential case main body 14.

凹部３３０は、環状壁部３２４の内部を肉抜きして成る空間であり、前方に開口する第１凹部３３１と、第１凹部３３１の内面からさらに後方に肉抜きして成る第２凹部３２２と、を備えている。
第１凹部３３１は、断面形状が略四角形状を呈しているとともに、軸線Ｏ３方向を中心に周方向に連続し、環状を呈している。
第２凹部３３２は、第１凹部３３１の底部からさらに後方に延びており、歯３２５ａの内部を肉抜きしている。よって、第２凹部３３２は、軸線Ｏ３方向から視た場合、ギヤ部３２５の各歯３２５ａと重なるように形成されている。 The concave portion 330 is a space formed by hollowing out the inside of the annular wall portion 324, and includes a first concave portion 331 that opens forward, and a second concave portion 322 that is thinned rearward from the inner surface of the first concave portion 331. It is equipped with.
The first recess 331 has a substantially quadrangular cross-sectional shape, is continuous in the circumferential direction around the axis O3 direction, and has an annular shape.
The second recess 332 extends further rearward from the bottom of the first recess 331, and the inside of the tooth 325a is thinned. Therefore, the second recess 332 is formed so as to overlap each tooth 325a of the gear portion 325 when viewed from the direction of the axis O3.

次に、デフケース本体１４の図示しない開口を介して、デフケース本体１４の内部に流入した潤滑油の流路について説明する。
左右輪の差回転により差動装置３１０が軸線Ｏ２回りに回転すると、潤滑油に遠心力が作用し、潤滑油は、ピニオンシャフト１２の外周面の図示しない溝部を通過して軸筒部３２３の前方側に流れる（矢印Ｇ１参照）。
また、デフケース本体１４の内周面１４ａと環状壁部３２４の外周面３２４ａとの間には、ワッシャ３２７及び補強リブ３２６が介在し、流路が狭くなっている。よって、補強リブ３２６を超えてギヤ部３２５に供給される潤滑油（矢印Ｇ２参照）の量が制限される。この結果、ワッシャ３２７及び補強リブ３２６により堰き止められた潤滑油は、第１凹部３３１内と第２凹部３３２内に貯留される。 Next, the flow path of the lubricating oil that has flowed into the differential case main body 14 through the opening (not shown) of the differential case main body 14 will be described.
When the differential device 310 rotates about the axis O2 due to the differential rotation of the left and right wheels, centrifugal force acts on the lubricating oil, and the lubricating oil passes through a groove portion (not shown) on the outer peripheral surface of the pinion shaft 12 and the shaft cylinder portion 323 It flows forward (see arrow G1).
Further, a washer 327 and a reinforcing rib 326 are interposed between the inner peripheral surface 14a of the differential case body 14 and the outer peripheral surface 324a of the annular wall portion 324, and the flow path is narrowed. Therefore, the amount of lubricating oil (see arrow G2) supplied to the gear portion 325 beyond the reinforcing rib 326 is limited. As a result, the lubricating oil blocked by the washer 327 and the reinforcing rib 326 is stored in the first recess 331 and the second recess 332.

以上、第４実施形態によれば、第１凹部３３１により環状壁部３２４が肉抜きされ、一対のデフピニオンギヤ３１３が従来のものよりも軽量化している。一方で、環状壁部３２４は、補強リブ３２６により強度が向上し、所定強度が確保されている。また、第１凹部３３１には、潤滑油が貯留されている。このため、摺動部（環状壁部３２４の外周面３２４ｂ）や、デフピニオンギヤ３１３のギヤ部３２５とサイドギヤ２０との噛み合い箇所に潤滑油を継続して供給することができる。   As described above, according to the fourth embodiment, the annular wall portion 324 is thinned by the first recess 331, and the pair of differential pinion gears 313 is lighter than the conventional one. On the other hand, the strength of the annular wall portion 324 is improved by the reinforcing rib 326, and a predetermined strength is ensured. The first recess 331 stores lubricating oil. Therefore, the lubricating oil can be continuously supplied to the sliding portion (the outer peripheral surface 324b of the annular wall portion 324) and the meshing portion between the gear portion 325 of the differential pinion gear 313 and the side gear 20.

ギヤ部３２５の各歯３２５ａのそれぞれは、第２凹部３３２により肉抜きされて中空になっており、一対のデフピニオンギヤ３１３がさらに軽量化している。また、第２凹部３３２内に貯留する潤滑油は、各歯３２５ａを内部から冷却することができ、冷却性能に優れる。   Each tooth 325a of the gear portion 325 is hollowed out by the second recess 332 to be hollow, and the pair of differential pinion gears 313 is further reduced in weight. Moreover, the lubricating oil stored in the 2nd recessed part 332 can cool each tooth | gear 325a from the inside, and is excellent in cooling performance.

以上、各実施形態について説明したが、本発明における第１凹部の断面形状は、三角形状に限らず、半円形状や四角形状などでもよく、特に限定されない。また、本発明の凹部は、第１凹部のみから構成され、第２凹部を備えていなくてもよい。また、本発明における第１凹部の外側周面は、開口側に近づくにつれて径方向外側に傾斜する傾斜面でなくてもよい。   As mentioned above, although each embodiment was described, the cross-sectional shape of the 1st recessed part in this invention is not limited to a triangular shape, A semicircle shape, square shape, etc. may be sufficient. Moreover, the recessed part of this invention is comprised only from the 1st recessed part, and does not need to be provided with the 2nd recessed part. Moreover, the outer peripheral surface of the 1st recessed part in this invention may not be an inclined surface which inclines radially outward as it approaches the opening side.

また、第２実施形態のガイドリブ３３は、両側面（右側面３３ａ及び左側面３３ｂ）が傾斜面となっているが、本発明においては、両側面のうち少なくても一方が傾斜面となっているものであってもよい。   The guide rib 33 according to the second embodiment has inclined surfaces on both side surfaces (the right side surface 33a and the left side surface 33b). In the present invention, at least one of the side surfaces is an inclined surface. It may be.

１ 終減速装置
１０，１１０、２１０ 差動装置
１１ デフケース
１２ ピニオンシャフト（シャフト）
１３，３１３ デフピニオンギヤ（差動装置用ギヤ）
１４ デフケース本体
１５ フランジ
１６ 左ボス部
１７ 右ボス部
２０，１２０，２２０ サイドギヤ（差動装置用ギヤ）
２１，１２１，２２１ 左サイドギヤ
２２ 右サイドギヤ
２３，２２３，３２３ 軸筒部
２３ａ 外周面
２４，３２４ 環状壁部
２４ａ 左側面
２４ｂ 外周面
２５，３２５ ギヤ部
２６，３２６ 補強リブ
２７，３２７ ワッシャ
３０，２３０ 凹部
３１，２３１，３３１ 第１凹部
３１ａ，３３１ａ 外側周面
３１ｂ，２３１ｂ 内側周面
３１ｃ 開口
３２，３３２ 第２凹部
３３ ガイドリブ
３３ａ 右側面
３３ｂ 左側面
Ｌ ドライブシャフト（シャフト） 1 Final Deceleration Device 10, 110, 210 Differential Device 11 Differential Case 12 Pinion Shaft (Shaft)
13,313 Differential pinion gear (differential gear)
14 Differential case body 15 Flange 16 Left boss portion 17 Right boss portion 20, 120, 220 Side gear (differential gear)
21, 121, 221 Left side gear 22 Right side gear 23, 223, 323 Shaft tube portion 23a Outer peripheral surface 24, 324 Annular wall portion 24a Left side surface 24b Outer peripheral surface 25, 325 Gear portion 26, 326 Reinforcement rib 27, 327 Washer 30, 230 Recessed parts 31, 231, 331 First recessed part 31a, 331a Outer peripheral surface 31b, 231b Inner peripheral surface 31c Opening 32,332 Second recessed part 33 Guide rib 33a Right side 33b Left side L Drive shaft (shaft)

Claims (6)

デフケース内に収容された差動装置用ギヤであって、
シャフトに外嵌される筒状の軸筒部と、
前記軸筒部の外周面から突出する環状の環状壁部と、
前記環状壁部から前記シャフトの軸線方向の一側に突出するギヤ部と、
前記環状壁部の外周面から突出する補強リブと、
前記環状壁部の内部を肉抜きして成り、前記シャフトの軸線方向の他側に開口する第１凹部と、
を備えていることを特徴とする差動装置用ギヤ。 A differential gear housed in a differential case,
A cylindrical shaft tube portion fitted on the shaft;
An annular wall portion protruding from the outer peripheral surface of the shaft tube portion;
A gear portion protruding from the annular wall portion to one side in the axial direction of the shaft;
Reinforcing ribs protruding from the outer peripheral surface of the annular wall,
A first recess formed by hollowing out the inside of the annular wall and opening to the other side in the axial direction of the shaft;
The gear for differential gears characterized by the above-mentioned. 前記第１凹部の内面から前記軸線方向の一側に肉抜きして成る第２凹部を備え、
前記ギヤ部を構成する複数の歯のそれぞれは、前記第２凹部により中空となっていることを特徴とする請求項１に記載の差動装置用ギヤ。 A second recess formed by hollowing out from the inner surface of the first recess to one side in the axial direction;
2. The differential gear according to claim 1, wherein each of the plurality of teeth constituting the gear portion is hollow by the second recess. 前記差動装置用ギヤは、デフピニオンギヤと噛合するサイドギヤであり、
前記第１凹部の内面のうち外側周面は、前記第１凹部の開口に近づくにつれて径方向外側に位置するように傾斜していることを特徴とする請求項１又は請求項２に記載の差動装置用ギヤ。 The differential gear is a side gear that meshes with a differential pinion gear;
3. The difference according to claim 1, wherein an outer peripheral surface of the inner surface of the first recess is inclined so as to be positioned radially outward as approaching the opening of the first recess. Gear for moving device. 前記第１凹部内で径方向に延在し、前記第１凹部内を周方向に区画する複数のガイドリブを備え、
前記ガイドリブにおいて前記軸線回りの一側を向く一側面は、径方向外側に向うにつれて前記軸線周りの他側に位置するように傾斜していることを特徴とする請求項３に記載の差動装置用ギヤ。 A plurality of guide ribs extending radially in the first recess and partitioning the first recess in the circumferential direction;
4. The differential device according to claim 3, wherein one side surface of the guide rib that faces one side around the axis is inclined so as to be located on the other side around the axis as it goes radially outward. Gears. 前記軸筒部の外周面は、前記第１凹部の内側周面を構成するとともに、軸方向に平坦に形成されていることを特徴とする請求項３又は請求項４に記載の差動装置用ギヤ。   5. The differential device according to claim 3, wherein an outer peripheral surface of the shaft tube portion forms an inner peripheral surface of the first recess and is formed flat in the axial direction. 6. gear. 前記請求項１から請求項５のいずれか１項に記載の差動装置用ギヤを備えたことを特徴とする差動装置。   A differential device comprising the differential gear according to any one of claims 1 to 5.
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US11391354B2 (en) 2022-07-19
US20210180672A1 (en) 2021-06-17
CN112639334A (en) 2021-04-09
CN112639334B (en) 2024-07-02
WO2020152872A1 (en) 2020-07-30
JP2020118185A (en) 2020-08-06

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